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Title: Dielectric barrier discharge-based plasma actuator operation in artificial atmospheres for validation of modeling and simulation

We present an experimental case study of time-resolved force production by an aerodynamic plasma actuator immersed in various mixtures of electropositive (N{sub 2}) and electronegative gases (O{sub 2} and SF{sub 6}) at atmospheric pressure using a fixed AC high-voltage input of 16 kV peak amplitude at 200 Hz frequency. We have observed distinct changes in the discharge structures during both negative- and positive-going voltage half-cycles, with corresponding variations in the actuator's force production: a ratio of 4:1 in the impulse produced by the negative-going half-cycle of the discharge among the various gas mixtures we explored, 2:1 in the impulse produced by the positive-going half-cycle, and cases in which the negative-going half-cycle dominates force production (by a ratio of 1.5:1), where the half-cycles produce identical force levels, and where the positive-going half cycle dominates (by a ratio of 1:5). We also present time-resolved experimental evidence for the first time that shows electrons do play a significant role in the momentum coupling to surrounding neutrals during the negative going voltage half-cycle of the N{sub 2} discharge. We show that there is sufficient macroscopic variation in the plasma that the predictions of numerical models at the microscopic level can be validated even though the plasmamore » itself cannot be measured directly on those spatial and temporal scales.« less
Authors:
; ;  [1]
  1. Department of Physics, United States Air Force Academy, Colorado 80840 (United States)
Publication Date:
OSTI Identifier:
22489894
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 11; Other Information: (c) 2015 U.S. Government; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACTUATORS; AMPLITUDES; ATMOSPHERIC PRESSURE; CONTROLLED ATMOSPHERES; DIELECTRIC MATERIALS; ELECTRIC DISCHARGES; ELECTRIC POTENTIAL; GASES; HZ RANGE; NITROGEN; OXYGEN; PLASMA; PULSES; SIMULATION; SULFUR FLUORIDES; TIME RESOLUTION; VALIDATION